On line auctions, gun shops, gun shows, pawn shops.
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Iver Johnson Arms and Cycle Works made a champion model shotgun.
Iver Johnson
Lack of demand
Numrich (Gun Parts Copr.) has some Iver Johnson parts.
Sometime in the 1880's.
Iver Johnson Champion$200.
Start with Gun Parts Corp and then start looking hard. Old gun parts are getting hard to find.
50-100 USD
$50-$125
Ivory johnson 16 guage chamion shot gun
My best guess is $350